태양전지용 실리콘 기판의 절삭손상 식각 조건에 의한 곡강도 변화

강병준; 박성은; 이승훈; 김현호; 신봉걸; 권순우; 변재원; 윤세왕; 김동환

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자료유형: 학술저널

저자정보: 강병준 (고려대학교 신소재공학과) 박성은 (고려대학교 신소재공학과) 이승훈 (고려대학교 신소재공학과) 김현호 (고려대학교 신소재공학과) 신봉걸 (서울산업대학교 신소재공학과) 권순우 (대한제당주식회사 중앙연구소) 변재원 (서울산업대학교 신소재공학과) 윤세왕 (대한제당주식회사 중앙연구소) 김동환 (고려대학교 신소재공학과)

저널정보: 한국재료학회 한국재료학회지 한국재료학회지 제20권 제11호

발행연도: 2010.1

수록면: 617 - 622 (6page)

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We have studied methods to save Si source during the fabrication process of crystalline Si solar cells. One way is to use a thin silicon wafer substrate. As the thickness of the wafers is reduced, mechanical fractures of the substrate increase with the mechanical handling of the thin wafers. It is expected that the mechanical fractures lead to a dropping of yield in the solar cell process. In this study, the mechanical properties of 220-micrometer-solar grade Cz p-type monocrystalline Si wafers were investigated by varying saw-damage etching conditions in order to improve the flexural strength of ultra-thin monocrystalline Si solar cells. Potassium hydroxide (KOH) solution and tetramethyl ammonium hydroxide (TMAH) solution were used as etching solutions. Etching processes were operated with a varying of the ratio of KOH and TMAH solutions in different temperature conditions. After saw-damage etching, wafers were cleaned with a modified RCA cleaning method for ten minutes. Each sample was divided into 42 pieces using an automatic dicing saw machine. The surface morphologies were investigated by scanning electron microscopy and 3D optical microscopy. The thickness distribution was measured by micrometer. The strength distribution was measured with a 4-point-bending tester. As a result, TMAH solution at $90^{\circ}C$ showed the best performance for flexural strength.

#solar cell #ultra-thin silicon wafer #saw damage etching #flexural strength

참고문헌 (7)

참고문헌 신청

R. M. Swanson / 2006 / Prog. Photovolt. Res. Appl. 14:443

R. Mertens / 2008 / in Proceedings of the International Symposium on the Physical and Failure Analysis of Integrated Circuits :1~5

K. A. Munzer / 1999 / IEEE Trans. Electron Dev. 46(10):2055

이준성 / 2009 / 결정질 실리콘 태양전지용 실리콘 기판의 표면 미세구조에 따른 곡강도 특성 / 한국재료학회지 19(1):18~23

L. D. Partain / 1995 / Solar Cells and Their Applications / John Willey & Sons :60

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